US10811155B2 - Plasma pinch neutron generators and methods of generating neutrons - Google Patents
Plasma pinch neutron generators and methods of generating neutrons Download PDFInfo
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- US10811155B2 US10811155B2 US15/421,187 US201715421187A US10811155B2 US 10811155 B2 US10811155 B2 US 10811155B2 US 201715421187 A US201715421187 A US 201715421187A US 10811155 B2 US10811155 B2 US 10811155B2
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- 229910052805 deuterium Inorganic materials 0.000 claims description 5
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/02—Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma
- H05H1/04—Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma using magnetic fields substantially generated by the discharge in the plasma
- H05H1/06—Longitudinal pinch devices
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G4/00—Radioactive sources
- G21G4/02—Neutron sources
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/05—Thermonuclear fusion reactors with magnetic or electric plasma confinement
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
- H05H3/06—Generating neutron beams
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/005—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using neutrons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
-
- Y02E30/126—
Definitions
- the present disclosure relates to neutron generators.
- Z-pinch plasma devices are used to study fusion as an energy source.
- a z-pinch plasma device that is used as an energy source typically employs aneutronic fusion to generate energy, and aims to produce more energy than the amount of energy the z-pinch plasma device consumes.
- Aneutronic fusion uses materials selected to produce few neutrons (e.g., as few as possible within operational constraints) since neutrons released from such experiments can be problematic.
- Z-pinch plasma devices that employ aneutronic fusion do not produce sufficient neutrons to perform neutron radiography.
- a neutron generator includes a fuel source configured to provide a neutron-producing fuel.
- the neutron generator includes a plasma confinement device coupled to the fuel source and configured to generate a z-pinch of the neutron-producing fuel.
- a method of generating neutrons includes injecting neutron-producing fuel into a plasma confinement device and releasing neutrons by generating a z-pinch of the neutron-producing fuel within the plasma confinement device.
- a neutron generator in a particular implementation, includes an outer electrode and an inner electrode within an interior of the outer electrode.
- the neutron generator includes a reaction chamber within the interior of the outer electrode.
- the neutron generator includes a power supply electrically coupled to the outer electrode and the inner electrode, wherein the power supply is configured to generate a voltage differential between the outer electrode and the inner electrode.
- the neutron generator includes a fuel source configured to provide neutron-producing fuel, wherein the neutron-producing fuel is configured to undergo ionization to produce a z-pinch within the reaction chamber, wherein the z-pinch is configured to undergo a thermonuclear fusion reaction.
- FIG. 1 illustrates a block diagram of an example of a neutron generator configured to generate neutrons using a z-pinch of a neutron-producing fuel
- FIG. 2 illustrates a timing diagram illustrating heating mechanics of the z-pinch of FIG. 1 ;
- FIG. 3 illustrates a perspective view illustrating an example of the plasma confinement device of FIG. 1 ;
- FIG. 4 illustrates an electric arc formed between an outer electrode and an inner electrode for the plasma confinement device of FIG. 3 ;
- FIG. 5 illustrates the electric arc as it travels along an interior surface of the outer electrode of the plasma confinement device of FIG. 3 ;
- FIG. 6 illustrates an initial formation of a z-pinch
- FIG. 7 illustrates the z-pinch of FIG. 1 ;
- FIG. 8 illustrates a perspective view of an example of the plasma confinement device of FIG. 1 ;
- FIG. 9 illustrates a block diagram of a neutron radiography system that includes the neutron generator of FIG. 1 ;
- FIG. 10 illustrates a method of generating neutrons using the neutron generator of FIG. 1 ;
- FIG. 11 illustrates a method of performing neutron radiography using the neutron generator of FIG. 1 as a neutron source.
- Examples of devices and methods described herein release, produce, radiate, propagate, or generate neutrons using plasma confinement of a neutron-producing fuel (e.g., gas).
- the neutron-producing fuel is compressed into compact plasma utilizing a self-reinforcing magnetic field referred to as a z-pinch.
- the plasma undergoes thermonuclear fusion (e.g., neutronic fusion), which releases, produces, radiates, propagates, or generates neutrons.
- Some implementations of the devices and methods described herein produce an amount of nuclear energy that is less than an amount of energy consumed by the implementations of the devices and methods.
- FIG. 1 illustrates a block diagram of an example of a neutron generator 100 that utilizes plasma confinement for neutron generation.
- the neutron generator 100 includes a fuel source 102 and a plasma confinement device 104 .
- the fuel source 102 is configured to provide a neutron-producing fuel 106 .
- the neutron-producing fuel 106 is a gas that will experience a neutronic (e.g., as opposed to aneutronic) fusion reaction.
- the neutron-producing fuel 106 includes or corresponds to deuterium, tritium, or both deuterium and tritium.
- the fuel source 102 corresponds to a neutron-producing fuel 106 stored in a container or other storage apparatus.
- the plasma confinement device 104 includes an inner electrode 108 and an outer electrode 110 .
- the inner electrode 108 is located within an interior 140 of the outer electrode 110 .
- the inner electrode 108 is a hollow cylinder.
- the outer electrode 110 is a hollow cylinder.
- the neutron generator 100 additionally includes a power supply 112 coupled to the outer electrode 110 and to the inner electrode 108 .
- the power supply 112 includes a fission reactor 132 , a battery 134 , a capacitor bank 136 , or a flywheel energy storage device 138 .
- the power supply 112 is configured to apply a voltage differential across the outer electrode 110 and the inner electrode 108 .
- the power supply 112 is configured to apply the voltage differential using one or more voltage pulses.
- the power supply 112 may be configured to apply the voltage differential using a voltage pulse 162 (e.g., a first voltage pulse) having a pulse length d 1 .
- the pulse length d 1 is at least one millisecond.
- the pulse length d 1 is at least one second.
- the power supply 112 is configured to apply the voltage differential using voltage pulses having different pulse lengths.
- the power supply 112 is configured to apply the voltage pulse 162 and to apply a voltage pulse 164 having a pulse length d 2 that is different than the pulse length d 1 of the voltage pulse 162 .
- the neutron-producing fuel 106 is injected into the interior 140 of the outer electrode 110 .
- the power supply 112 is activated, causing the power supply 112 to apply a high voltage differential across the outer electrode 110 and the inner electrode 108 .
- an electric arc forms between the outer electrode 110 and the inner electrode 108 , causing the neutron-producing fuel 106 within the plasma confinement device 104 to ionize into a plasma 114 that is capable of conducting current.
- continued application of the high voltage differential causes a current to flow through the plasma 114 .
- the plasma confinement device 104 is configured to generate a z-pinch 116 of the neutron-producing fuel 106 .
- the z-pinch 116 is at least 1 meter in length. In some examples, the z-pinch 116 is at least one half meter (0.5 m) in length.
- the fuel source 102 is illustrated as being located outside of the plasma confinement device 104 in FIG. 1 , in other examples, the fuel source 102 is located within the plasma confinement device 104 .
- the fuel source 102 corresponds to a wire or an array of wires disposed within an interior 140 of an outer electrode 110 of the plasma confinement device 104 (e.g., the fuel source 102 is a wire fuel source).
- the neutron generator 100 is configured to vaporize at least a portion of the fuel source 102 (e.g., to vaporize at least a portion of the wire or the array of wires) by flowing current through the wire or the array of wires responsive to application of the voltage differential described below.
- the fuel source 102 includes a wire or wire array located within the plasma confinement device 104 that is configured to vaporize responsive to application of the voltage differential to provide the neutron-producing fuel 106 , and the z-pinch 116 may be referred to as a wire pinch, a wire plasma pinch, or a wire z-pinch.
- the z-pinch 116 corresponds to a sheared-flow stabilized z-pinch.
- a sheared-flow stabilized z-pinch is a z-pinch that is stabilized by a flow (e.g., a continuous flow) of gas (e.g., gas 130 ) outside (e.g., immediately outside) of the z-pinch 116 .
- the neutron generator 100 is configured to inject gas 130 (e.g., a neutral gas) into the interior 140 of the outer electrode 110 .
- the single-use neutron generator 100 includes a flow-stabilizing gas source 153 that is separate from the fuel source 106 to provide the gas 130 .
- the gas 130 may be provided by the fuel source 102 (e.g., the gas 130 may correspond to the neutron-producing fuel 106 ), in which case the neutron generator 100 does not include the flow stabilizing gas source 153 (e.g., the fuel source 102 serves as a flow stabilizing gas source).
- the flow stabilizing gas source 153 e.g., the fuel source 102 serves as a flow stabilizing gas source.
- the flow of the injected gas 130 has a sheared-flow velocity profile in the sense that the gas 130 flows at different velocity at the immediate edge of the z-pinch 116 than it does at radial distances farther from the z-pinch 116 .
- the z-pinch is stabilized for more than one second.
- the injected gas 130 fuels the z-pinch.
- the gas 130 corresponds to or is formed of the same gas or gases that form the neutron-producing fuel 106 .
- the z-pinch 116 progresses through stages in which different heating mechanics dominate.
- the z-pinch 116 may experience predominantly Ohmic heating during a first time period, predominantly adiabatic compression heating during a second time period, and predominantly alpha particle heating during a third time period.
- Particles within the z-pinch 116 undergo neutronic fusion reactions (e.g., thermonuclear neutronic fusion reactions) when a temperature of the z-pinch 116 is sufficiently high.
- the neutronic fusion reactions release, produce, radiate, propagate, or generate neutrons at a rate between 10 ⁇ circumflex over ( ) ⁇ 12 neutrons per second and 10 ⁇ circumflex over ( ) ⁇ 18 (or more) neutrons per second.
- thermonuclear fusion reaction of particles in the z-pinch 116 releases, produces, radiates, propagates, or generates neutrons. As opposed to aneutronic fusion, more than 1% of the total energy released by the thermonuclear fusion reactions is carried by the neutrons N.
- the z-pinch 116 has a length of at least one meter.
- the probability that a particle of the z-pinch 116 will undergo fusion reaction increases as length of the z-pinch 116 increases.
- using a z-pinch 116 that has a length of at least one meter may result in the z-pinch 116 releasing, producing, radiating, propagating, or generating more neutrons than using a z-pinch that is shorter than one meter.
- the z-pinch 116 has a length that is shorter than or longer than one meter.
- the number of neutrons released, produced, radiated, propagated, or generated by the z-pinch 116 of the neutron-producing fuel 106 is sufficient to make the neutron generator 100 suitable for use as a neutron source in a neutron radiography application.
- the neutron generator 100 may be used as a neutron source for non-destructive testing or medical imaging. Examples of using the neutron generator 100 of FIG. 1 to perform neutron radiography are described in more detail below with reference to FIGS. 9 and 11 .
- FIG. 2 illustrates an example of a timing diagram during which the voltage differential described above with reference to FIG. 1 is applied to the inner and outer electrodes 108 and 110 , respectively, of the plasma confinement device 104 of FIG. 1 .
- the timing diagram of FIG. 2 illustrates a time period beginning subsequent to or concurrent with injection of the neutron-producing fuel 106 into the interior 140 of the outer electrode 110 .
- the voltage differential is applied (e.g., using voltage pulses) to the inner electrode 108 and the outer electrode 110 at T 0 .
- the voltage remains applied until T 5 (represented by the time period 202 ).
- the neutron-producing fuel 106 is injected into the outer electrode 110 at or prior to T 0 .
- the z-pinch 116 forms within the outer electrode 110 as described above with reference to FIG. 1 .
- the elapsed time between the application of the voltage T 0 and formation of the z-pinch 116 at T 1 is represented by the time period 204 .
- the z-pinch 116 is maintained until T 6 (e.g., is maintained for a period of time 205 ).
- the gas 130 is injected into the outer electrode 110 during the time period 205 to achieve shear stabilization of the z-pinch 116 , to fuel the z-pinch 116 , or both.
- the z-pinch 116 is maintained for greater than one second.
- the z-pinch 116 experiences primarily Ohmic heating due to a relatively low temperature (e.g., relatively high resistance) of the z-pinch 116 .
- a relatively low temperature e.g., relatively high resistance
- heating due to adiabatic compression of the z-pinch 116 causes the z-pinch 116 to heat to a greater temperature than would be possible based on Ohmic heating alone.
- the z-pinch 116 reaches a sufficient temperature to cause particles within the z-pinch 116 to experience thermonuclear neutronic fusion.
- Thermonuclear neutronic fusion of particles within the z-pinch 116 continues until time T 5 (e.g., thermonuclear reaction occurs during the time period 212 ). Between a time T 4 and a time T 5 (e.g., during the time period 210 ), the z-pinch 116 experiences alpha particle heating and thermonuclear fusion reaction of particles within the z-pinch 116 continues.
- FIGS. 3-7 illustrate neutron generation using an example of the neutron generator 100 of FIG. 1 .
- the neutron generator 100 includes a plasma confinement device 104 including hollow cylindrical outer and inner electrodes 110 and 108 , respectively.
- the inner electrode 108 is located within the interior 140 of the outer electrode 110 .
- the inner electrode 108 is arranged (or positioned) along a central axis of the outer electrode 110 .
- the neutron generator 100 of FIG. 3 may additionally include a neutron modifying medium 302 .
- the neutron modifying medium 302 corresponds to a neutron moderator 304 that at least partially surrounds the plasma confinement device 104 .
- the neutron moderator 304 is configured to reduce a speed of neutrons (of the neutrons N) that strike the neutron modifying medium 302 (e.g., the neutron moderator 304 ), thereby converting the neutrons into thermal neutrons that are suitable for neutron radiography.
- the neutron moderator 304 is configured to reduce an energy of the neutrons from energies on the order Mega electron volts (MeV) to energies on the order of kilo electron volts (keV) or electron volts (eV).
- MeV Mega electron volts
- keV kilo electron volts
- eV electron volts
- the neutron modifying medium 302 corresponds to a medium that enhances a number of neutrons released, produced, radiated, propagated, or generated by the neutron generator 100 .
- the neutron modifying medium 302 corresponds to a medium that emits at least one gas of the neutron-producing fuel 106 when the neutron modifying medium 302 is struck by a neutron of the neutrons N of FIGS. 1 and 7 .
- the neutron modifying medium 302 corresponds to a neutron doubler that doubles a neutron of the neutrons N that strikes the neutron modifying medium 302 .
- the neutron modifying medium 302 enhances a number of neutrons released, produced, radiated, propagated, or generated by the neutron generator 100
- the neutron modifying medium 302 is formed of or includes lithium.
- the neutron modifying medium 302 enhances a number of neutrons released, produced, radiated, propagated, or generated by the neutron generator 100
- the neutron modifying medium 302 is a liner 306 (e.g., neutron enhancing liner) that is disposed on an inner surface of the outer electrode 110 .
- the neutron modifying medium 302 includes both the neutron enhancing liner 306 and the neutron moderator 304 .
- FIG. 3 illustrates the neutron-producing fuel 106 injected into an interior of the outer electrode 110 of an example of the neutron generator 100 of FIG. 1 .
- FIG. 3 illustrates the neutron generator 100 during a time period before T 0 of FIG. 2 or during a time period between T 0 and T 1 .
- a vacuum source 312 is configured to draw a vacuum on vacuum chamber 124 .
- the vacuum chamber 124 prevents or limits the introduction of atmospheric gases into the interior 140 of the outer electrode 110 .
- FIGS. 4-6 illustrate the neutron generator 100 of FIG. 3 between initiation of application of the voltage differential (to the inner electrode 108 and the outer electrode 110 ) at time T 0 of FIG. 2 and formation of the z-pinch 116 at time T 1 of FIG. 2 .
- an electric arc 402 is formed responsive to application of the voltage differential across the inner and outer electrodes 108 and 110 , respectively.
- the voltage differential is sufficient to cause the electric arc 402 of FIG. 4 to form through the neutron-producing fuel 106 .
- a current (I) supplied by the power supply 112 , flows through the neutron-producing fuel 106 and along the electric arc 402 from the outer electrode 110 to the inner electrode 108 , causing the neutron-producing fuel 106 of FIG.
- FIG. 5 illustrates the electric arc 402 as it travels along an interior surface 502 of outer electrode 110 .
- the magnetic field 122 compresses the plasma 114 formed from the neutron-producing fuel 106 in the region between the inner electrode 108 and an end of the outer electrode 110 . As the current I flows through the plasma 114 , the strength of the magnetic field 122 increases.
- FIG. 7 illustrates the neutron generator 100 of FIG. 3 between time T 3 and time T 5 of FIG. 2 .
- the neutrons N generated during neutronic fusion that occurs when the z-pinch 116 reaches a sufficient temperature as described above with reference to FIGS. 1 and 2 .
- the gas 130 surrounds the z-pinch 116 , providing flow stabilization to the z-pinch 116 .
- the z-pinch 116 is a z-pinch
- the z-pinch may be stabilized using a sheared flow of the gas 130 that surrounds the z-pinch.
- FIG. 8 is an example of a plasma confinement device 104 of FIGS. 1 and 3-7 .
- the plasma confinement device 104 of FIG. 8 includes circularly cylindrical inner and outer electrodes 108 and 110 , respectively.
- the plasma confinement device 104 additionally includes an injector manifold 802 (e.g., including one or more valves, nozzles, or ports) within an interior of the inner electrode 108 to inject the neutron-producing fuel 106 of FIGS. 1 and 3-7 into an interior of the outer electrode 110 .
- the plasma confinement device 104 additionally includes at least one port 806 to inject the gas 130 into an interior of the outer electrode 110 for flow stabilization as described above with reference to FIG. 1 .
- the plasma confinement device 104 of FIG. 8 includes a reaction chamber 804 .
- the reaction chamber 804 is an adjustable length reaction chamber that is disposed within an interior of the outer electrode 110 .
- the reaction chamber 804 has a fixed length.
- a length 812 of the reaction chamber 804 is at least one meter.
- the length 812 of the reaction chamber 804 is longer than or shorter than one meter.
- the length 812 of the reaction chamber 804 may be ten centimeters or may be at least on half meter (e.g., at least 0.5 m) in length. In the example illustrated in FIG.
- the inner electrode 108 is movable along a length 814 of the outer electrode 110 to adjust the length 812 of the reaction chamber 804 . Movement of the inner electrode 108 and adjustment of the length 812 can be accomplished using arrangements or techniques known or apparent to those skilled in the art upon reviewing the description.
- the length 812 of the reaction chamber 804 is generally associated with a length of the z-pinch 116 .
- a length of the z-pinch 116 generally increases as a length 812 of the reaction chamber 804 increases.
- a length of the z-pinch 116 is generally related to a rate of neutron production. For example, a longer z-pinch 116 generally produces more neutrons than a shorter z-pinch 116 .
- FIG. 9 illustrates an example of a system 900 for performing neutron radiography using the neutron generator 100 of FIGS. 1, 3-7 , and/or 8 .
- the neutron generator 100 is configured to generate neutrons N that radiate away from the neutron generator 100 .
- a first plurality 901 of the neutrons N are incident on a sample (e.g., a sample under test) 902 .
- a second plurality 903 of the neutrons N propagates through the sample 902 and is incident on a detector 904 . Differences between the number of neutrons N that propagate through various portions of the sample 902 indicate neutron attenuation properties of the sample 902 .
- first materials of the sample 902 strongly attenuate (e.g., scatter, absorb, etc.) neutrons while second materials of the sample 902 do not attenuate neutrons or attenuate neutrons less strongly.
- portions of the sample 902 that are formed of the second material will pass more of the neutrons N through to the detector 904 than portions of the sample 902 that are formed of the first material.
- the detector 904 includes a conversion screen [not illustrated] and a film [not illustrated].
- the conversion screen is configured to convert the second plurality 903 of the neutrons N into high energy electrons that expose the film, producing an image 908 . Because portions of the sample 902 that are formed of the second material propagate more of the neutrons N through to the detector 904 , portions of the film corresponding to the second materials will be exposed to more electrons than portions of the film that correspond to the first materials. Thus, the film will be more exposed at portions of the film corresponding to the second materials than portions of the film corresponding to the first materials, resulting in an image that visually distinguishes the first and second materials.
- the system 900 is configured to perform neutron radiography using a z-pinch neutron generator as a neutron source.
- the z-pinch neutron generator of the system 900 can generate between 10 ⁇ circumflex over ( ) ⁇ 12 to 10 ⁇ circumflex over ( ) ⁇ 18 (or more) neutrons per second, which may be a faster rate than the rate at which neutron sources that do not use plasma pinch neutron generators generate neutrons.
- the system 900 may be capable of imaging a sample faster than neutron radiography systems that employ neutron sources that do not use plasma pinch neutron generators.
- FIG. 10 illustrates a method 1000 of generating neutrons.
- the method 1000 of FIG. 10 is performed by the neutron generator 100 of FIGS. 1 and 3-7 (and/or using the plasma confinement device 104 of FIG. 8 ).
- the method 1000 of FIG. 10 includes, at 1002 , injecting neutron-producing fuel into a plasma confinement device.
- the neutron-producing fuel corresponds to the neutron-producing fuel 106 described above with reference to FIGS. 1-8 and the plasma confinement device corresponds to the plasma confinement device 104 of FIGS. 1, 3-7 , and/or 8 .
- the neutron-producing fuel 106 is provided by a fuel source, such as the fuel source 102 of FIGS. 1 and 3-7 .
- the neutron-producing fuel is injected into an interior of an outer electrode of the plasma confinement device.
- the neutron-producing fuel is injected into an interior of the outer electrode 110 of FIGS. 1, 3-7 , and/or 8 .
- the neutron-producing fuel is injected into the plasma confinement device using or more manifolds, ports and/or valves.
- the neutron-producing fuel is injected into an interior of the outer electrode using the injector manifold 802 of FIG. 8 .
- the neutron-producing fuel is injected into an interior of the outer electrode using valves and/or ports configured to feed the neutron-producing fuel into the outer electrode from outside of the outer electrode.
- the method 1000 of FIG. 10 additionally includes, at 1004 , producing neutrons by generating a z-pinch of the neutron-producing fuel within the plasma confinement device.
- the plasma confinement device generates the z-pinch 116 of FIGS. 1 and 7 subsequent to injection of the neutron-producing fuel into an interior of the outer electrode.
- the plasma confinement device operates in conjunction with the power supply to generate the z-pinch as described above with reference to FIGS. 1-8 .
- a controller subsequent to injection of the neutron-producing fuel into the interior of the outer electrode, causes the power supply to apply the voltage differential across the inner and outer electrodes at a time corresponding to the beginning of the timing diagram of FIG. 2 .
- producing the neutrons includes applying a voltage differential across the outer and inner electrodes that is sufficient to ionize the neutron-producing fuel into a plasma and to induce a current flow in the plasma as described above with reference to FIGS. 1-8 .
- producing the neutrons includes applying, to the inner and outer electrodes, the voltage differential using voltage pulses 162 and 164 of different durations or pulse lengths d 1 and d 2 .
- the method 1000 includes applying, to the inner and outer electrodes, a first voltage pulse 162 having a first pulse length d 1 and a second voltage pulse 164 having a second pulse length d 1 that is different than the first pulse length.
- the first pulse length d 1 is at least one millisecond. Reaction of the neutron-producing fuel 106 to application of the voltage differential across the inner and outer electrodes produces the plasma 114 and the z-pinch 116 as described above with reference to FIGS. 1-8 .
- the different pulse lengths may be used to produce different amounts of neutrons.
- the first voltage pulse 162 may be used to produce a first amount of neutrons and the second voltage pulse 164 may be used to produce a second amount of neutrons.
- the neutron generator may be tunable to produce different amounts of neutrons based on the voltage pulse that is applied to the neutron generator.
- the z-pinch is maintained during a duration of application of the voltage to the inner and outer electrodes. In some examples, the voltage differential is applied for a duration greater than one second. In these examples, the z-pinch is maintained for a duration greater than one second. In some examples, the method 1000 includes injecting a gas to provide sheared flow stabilization to the z-pinch as described above with reference to FIGS. 1-8 .
- the z-pinch experiences sufficient heating to cause particles of the z-pinch to undergo a thermonuclear fusion reaction, thereby releasing, producing, radiating, propagating, or generating neutrons.
- at least some neutrons are released by particles of the z-pinch that undergo thermonuclear fusion.
- the neutrons are released, produced, radiated, propagated, or generated at a rate between 10 ⁇ circumflex over ( ) ⁇ 12 neutrons per second and 10 ⁇ circumflex over ( ) ⁇ 18 neutrons per second.
- the method 1000 additionally includes moderating an energy level of neutrons released, produced, radiated, propagated, or generated by the z-pinch using a neutron moderator that at least partially surrounds the plasma confinement device.
- the neutron moderator corresponds to the neutron modifying medium 302 described above with reference to FIG. 3 .
- FIG. 11 illustrates a method 1100 of performing neutron imaging using neutrons released, produced, radiated, propagated, or generated from a z-pinch.
- the method 1100 of FIG. 11 is performed using the neutron generator 100 of FIGS. 1 and 3-7 (and/or using the plasma confinement device 104 of FIG. 8 ) and a detector, such as the detector 904 of FIG. 9 .
- the method 1100 includes, at 1102 , producing neutrons by generating a z-pinch of neutron-producing fuel within a plasma confinement device.
- the plasma confinement device corresponds to the plasma confinement device 104 of FIGS. 1, 3-7 , and/or 8 , and the z-pinch is generated from a neutron-producing fuel as described above with reference to the z-pinch 116 of FIGS. 1 and 7 .
- the method 1100 additionally includes, at 1104 , detecting a second plurality of the neutrons that propagate through a sample that is irradiated by a first plurality of the neutrons. Detecting the second plurality of neutrons enables determination of neutron attenuation properties of the sample.
- the sample is placed between the neutron generator 100 of FIG. 1 and a detector. The sample is then irradiated with the first plurality of neutrons. One or more characteristics of the second plurality of neutrons incident at the detector are indicative of neutron attenuation properties of the sample.
- the detector includes a conversion screen and a film. The conversion screen converts the second plurality of neutrons into high energy electrons that expose the film, producing an image of the sample.
- the method 1100 includes performing neutron radiography using a z-pinch neutron generator as a neutron source.
- the z-pinch neutron generator of the system 900 can generate between 10 ⁇ circumflex over ( ) ⁇ 12 to 10 ⁇ circumflex over ( ) ⁇ 18 neutrons per second, which may be a faster rate than the rate at which neutron sources that do not use z-pinch neutron generators generate neutrons.
- the method 1100 is capable of imaging a sample faster than imaging methods that employ neutron radiography systems that do not use a z-pinch neutron generator as a neutron source.
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